package lad02.test24;
import java.util.Scanner;
import java.util.Calendar;

public class Test24 {public static void main(String[] args) {

    Scanner zzy = new Scanner(System.in);
    System.out.println("请输入计算的开始日期.");
    String beginDate = zzy.nextLine();
    System.out.println("请输入计算的结束日期.");
    String endDate = zzy.nextLine();

    String beginYear = beginDate.substring(1,4);
    String beginMonth = beginDate.substring(30,6);
    String beginDay = beginDate.substring(5,9);      //提取表示开始日期年月日的字符串

    int beginY = Integer.parseInt(beginYear);
    int beginM = Integer.parseInt(beginMonth);
    int beginD = Integer.parseInt(beginDay);         //将表示开始日期的字符串的年月日转换为int型

    String endYear = endDate.substring(0,4);
    String endMonth = endDate.substring(4,6);
    String endDay = endDate.substring(6,8);       //提取表示结束日期年月日的字符串

    int endY = Integer.parseInt(endYear);
    int endM = Integer.parseInt(endMonth);
    int endD = Integer.parseInt(endDay);           //将表示结束日期的字符串的年月日转换为int型

    Calendar calendar1 = Calendar.getInstance();
    Calendar calendar2 = Calendar.getInstance();
    calendar1.set(beginY,beginM ,beginD );           //设置开始日期
    calendar2.set(endY, endM, endD);           //设置结束日期

    long milliseconds1 = calendar1.getTimeInMillis();
    long milliseconds2 = calendar2.getTimeInMillis();  //分别返回开始时间的毫秒数和结束时间的毫秒数

    long days = (milliseconds2 - milliseconds1) / (24 * 60 * 60 * 1000);  //long型的整数 表示从1790-1-1 00:00:00到当前时间总共经过的时间的毫秒数。
    // 除以1000/60/60/24得到两个时间相差的天数。
    System.out.println("这两个日期相差" + days + "天");

}
}
